Fluid Catalytic Cracking Process by Shaw and Axens

Selective conversion of gas oil feedstocks.

Catalytic and selective cracking in a short-contact-time riser where oil feed is effectively dispersed and vaporized through a proprietary feed-injection system. Operation is carried out at a temperature consistent with targeted yields. The riser temperature profile can be optimized with the proprietary mixed temperature control (MTC) system.

Reaction products exit the riser-reactor through a high-efficiency, close-coupled, proprietary riser termination device RSS (riser separator stripper). Spent catalyst is pre-stripped followed by an advanced high efficiency packed stripper prior to regeneration. The reaction product vapor may be quenched to give the lowest possible dry gas and maximum gasoline yield. Final recovery of catalyst particles occurs in cyclones before the product vapor is transferred to the fractionation section.

Catalyst regeneration is carried out in a single regenerator equipped with proprietary air and catalyst distribution systems, and may be operated for either full or partial CO combustion. Heat removal for heavier feed stocks may be accomplished by using reliable dense-phase catalyst cooler, which has been commercially proven in over 56 units. As an alternative to catalyst cooling, this unit can easily be retrofitted to a two-regenerator system (R2R) in the event that a future resid operation is desired.

The converter vessels use a cold-wall design that results in minimum capital investment and maximum mechanical reliability and safety. Reliable operation is ensured through the use of advanced fluidization technology combined with a proprietary reaction system. Unit design is tailored to the refiner’s needs and can include wide turn down flexibility.

Available options include power recovery, waste-heat recovery, flue-gas treatment and slurry filtration. Revamps incorporating proprietary feed injection and riser termination devices and vapor quench result in substantial improvements in capacity, yields and feed stock flexibility within the mechanical limits of the existing unit.

Products: High-octane gasoline, distillate and C3 – C4 olefins.

Licensor: Shaw and Axens.

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